diff --git a/retroshare-gui/src/gui/FileTransfer/TransfersDialog.cpp b/retroshare-gui/src/gui/FileTransfer/TransfersDialog.cpp
index d0b4d5fc7..aa9b50298 100644
--- a/retroshare-gui/src/gui/FileTransfer/TransfersDialog.cpp
+++ b/retroshare-gui/src/gui/FileTransfer/TransfersDialog.cpp
@@ -2244,6 +2244,10 @@ void TransfersDialog::chunkStreaming()
 }
 void TransfersDialog::chunkRandom()
 {
+#ifdef WINDOWS_SYS
+    if(QMessageBox::Yes != QMessageBox::warning(nullptr,tr("Warning"),tr("On Windows systems, writing in the middle of large empty files may hang the software for several seconds. Do you want to use this option anyway?"),QMessageBox::Yes,QMessageBox::No))
+        return;
+#endif
 	setChunkStrategy(FileChunksInfo::CHUNK_STRATEGY_RANDOM) ;
 }
 void TransfersDialog::chunkProgressive()
diff --git a/retroshare-gui/src/gui/settings/TransferPage.cpp b/retroshare-gui/src/gui/settings/TransferPage.cpp
index 4b704ddd3..dfd8944a2 100644
--- a/retroshare-gui/src/gui/settings/TransferPage.cpp
+++ b/retroshare-gui/src/gui/settings/TransferPage.cpp
@@ -30,6 +30,7 @@
 #include "retroshare/rspeers.h"
 
 #include <QCheckBox>
+#include <QMessageBox>
 #include <QToolTip>
 
 #include <iostream>
@@ -214,11 +215,19 @@ void TransferPage::updateDefaultStrategy(int i)
 		case 0: rsFiles->setDefaultChunkStrategy(FileChunksInfo::CHUNK_STRATEGY_STREAMING) ;
 				  break ;
 
-		case 2: rsFiles->setDefaultChunkStrategy(FileChunksInfo::CHUNK_STRATEGY_RANDOM) ;
-				  break ;
+        case 2:
+#ifdef WINDOWS_SYS
+                if(QMessageBox::Yes != QMessageBox::warning(nullptr,tr("Warning"),tr("On Windows systems, randomly writing in the middle of large empty files may hang the software for several seconds. Do you want to use this option anyway?"),QMessageBox::Yes,QMessageBox::No))
+                {
+                    ui._defaultStrategy_CB->setCurrentIndex(0);
+                    return;
+                }
+#endif
+                rsFiles->setDefaultChunkStrategy(FileChunksInfo::CHUNK_STRATEGY_RANDOM) ;
+                break ;
 
 		case 1: rsFiles->setDefaultChunkStrategy(FileChunksInfo::CHUNK_STRATEGY_PROGRESSIVE) ;
-				  break ;
+                break ;
 		default: ;
 	}
 }
diff --git a/retroshare-gui/src/gui/settings/TransferPage.ui b/retroshare-gui/src/gui/settings/TransferPage.ui
index 7ab2b9493..fc2b17b91 100644
--- a/retroshare-gui/src/gui/settings/TransferPage.ui
+++ b/retroshare-gui/src/gui/settings/TransferPage.ui
@@ -30,7 +30,7 @@
           <item>
            <widget class="QPushButton" name="editShareButton">
             <property name="text">
-             <string>Edit Share</string>
+             <string>Configure shared directories</string>
             </property>
            </widget>
           </item>